Explode ci.yaml workflow

.github/workflows/phpunit.yaml

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+name: phpunit
+
+on:
+    - pull_request
+    - push
+
+jobs:
+    phpunit:
+        name: Tests
+        runs-on: ${{ matrix.os }}
+        strategy:
+            fail-fast: false
+            matrix:
+                os:
+                    - ubuntu-latest
+                php:
+                    - '8.1'
+                nsq:
+                    - nsq-1.2.0.linux-amd64.go1.12.9
+                    - nsq-1.2.1.linux-amd64.go1.16.6
+                dependencies:
+                    - lowest
+                    - highest
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v2
+
+            -   name: Setup PHP
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php }}
+                    coverage: pcov
+                    extensions: kjdev/php-ext-snappy@0.2.1
+                env:
+                    update: true
+
+            - name: Download NSQ
+              run: |
+                  curl -sSL "http://bitly-downloads.s3.amazonaws.com/nsq/${{ matrix.nsq }}.tar.gz" \
+                            | tar -xzv --strip-components=1
+                  ./bin/nsqd --version
+
+            -   name: Setup Problem Matchers for PHPUnit
+                run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+
+            -   name: Determine Composer cache directory
+                id: composer-cache
+                run: echo "::set-output name=directory::$(composer config cache-dir)"
+
+            -   name: Cache Composer dependencies
+                uses: actions/cache@v2
+                with:
+                    path: ${{ steps.composer-cache.outputs.directory }}
+                    key: ${{ runner.os }}-${{ matrix.php }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.json') }}
+                    restore-keys: ${{ runner.os }}-${{ matrix.php }}-${{ matrix.dependencies }}-composer-
+
+            -   name: Install highest dependencies
+                run: composer update --no-progress --no-interaction --prefer-dist
+                if: ${{ matrix.dependencies == 'highest' }}
+
+            -   name: Install lowest dependencies
+                run: composer update --no-progress --no-interaction --prefer-dist --prefer-lowest
+                if: ${{ matrix.dependencies == 'lowest' }}
+
+            -   name: Run tests
+                run: vendor/bin/phpunit --coverage-clover=build/coverage-report.xml
+
+            -   name: Upload code coverage
+                uses: codecov/codecov-action@v1
+                with:
+                    file: build/coverage-report.xml